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The BMW Range
3 Series
E46
Cleaning your E46 Air Mass Sensor (KL/PJ) area.
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<blockquote data-quote="jarance" data-source="post: 365114" data-attributes="member: 21"><p>there is a difference in the shape between MAF and AFM. However, both measure air flow.</p><p></p><p>See picture below:-</p><p></p><p><img src="http://i122.photobucket.com/albums/o271/pbjy/AFM/MAFandAFM2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i122.photobucket.com/albums/o271/pbjy/AFM/MAFandafm1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>AFM measure air flow by the flap or vane deflection. This in turn will slide along a thin film resistor.</p><p></p><p>MAF measure air flow by 2 heating wires. By measure the change in temperature, the flow is determine.</p><p></p><p>Pro of AFM - </p><p>Simple in design and robust.</p><p>Easy to maintain</p><p></p><p>Pro of MAF - </p><p>No moving part hence less maintenance.</p><p>Easy to clean</p><p></p><p>Con of AFM - </p><p>Thin film Resistor can wear off due to long usage.</p><p>Vane tends to jam up due to dirt build up</p><p></p><p>Con of MAF -</p><p>Hot wires tends to be coated by dirt or oil which lead to misreading of air flow.</p></blockquote><p></p>
[QUOTE="jarance, post: 365114, member: 21"] there is a difference in the shape between MAF and AFM. However, both measure air flow. See picture below:- [IMG]http://i122.photobucket.com/albums/o271/pbjy/AFM/MAFandAFM2.jpg[/IMG] [IMG]http://i122.photobucket.com/albums/o271/pbjy/AFM/MAFandafm1.jpg[/IMG] AFM measure air flow by the flap or vane deflection. This in turn will slide along a thin film resistor. MAF measure air flow by 2 heating wires. By measure the change in temperature, the flow is determine. Pro of AFM - Simple in design and robust. Easy to maintain Pro of MAF - No moving part hence less maintenance. Easy to clean Con of AFM - Thin film Resistor can wear off due to long usage. Vane tends to jam up due to dirt build up Con of MAF - Hot wires tends to be coated by dirt or oil which lead to misreading of air flow. [/QUOTE]
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Cleaning your E46 Air Mass Sensor (KL/PJ) area.
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